6.1-stable review patch. If anyone has any objections, please let me know.
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From: Frank Li Frank.Li@nxp.com
commit 92f02efa1d86d7dcaef7f38a5fe3396c4e88a93c upstream.
ISO basic transfer is ITP(SOF) Package_0 Package_1 ... Package_n
CDNS3 DMA start dma transfer from memmory to internal FIFO when get SOF, controller will transfer data to usb bus from internal FIFO when get IN token.
According USB spec defination: Maximum number of packets = (bMaxBurst + 1) * (Mult + 1)
Internal memory should be the same as (bMaxBurst + 1) * (Mult + 1). DMA don't fetch data advance when ISO transfer, so only reserve (bMaxBurst + 1) * (Mult + 1) internal memory for ISO transfer.
Need save Mult and bMaxBurst information and set it into EP_CFG register, otherwise only 1 package is sent by controller, other package will be lost.
Cc: stable@vger.kernel.org Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") Signed-off-by: Frank Li Frank.Li@nxp.com Link: https://lore.kernel.org/r/20231224153816.1664687-3-Frank.Li@nxp.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/cdns3/cdns3-gadget.c | 59 +++++++++++++++++++++++---------------- drivers/usb/cdns3/cdns3-gadget.h | 3 + 2 files changed, 39 insertions(+), 23 deletions(-)
--- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -2062,11 +2062,10 @@ int cdns3_ep_config(struct cdns3_endpoin bool is_iso_ep = (priv_ep->type == USB_ENDPOINT_XFER_ISOC); struct cdns3_device *priv_dev = priv_ep->cdns3_dev; u32 bEndpointAddress = priv_ep->num | priv_ep->dir; - u32 max_packet_size = 0; - u8 maxburst = 0; + u32 max_packet_size = priv_ep->wMaxPacketSize; + u8 maxburst = priv_ep->bMaxBurst; u32 ep_cfg = 0; u8 buffering; - u8 mult = 0; int ret;
buffering = priv_dev->ep_buf_size - 1; @@ -2088,8 +2087,7 @@ int cdns3_ep_config(struct cdns3_endpoin break; default: ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC); - mult = priv_dev->ep_iso_burst - 1; - buffering = mult + 1; + buffering = (priv_ep->bMaxBurst + 1) * (priv_ep->mult + 1) - 1; }
switch (priv_dev->gadget.speed) { @@ -2100,17 +2098,8 @@ int cdns3_ep_config(struct cdns3_endpoin max_packet_size = is_iso_ep ? 1024 : 512; break; case USB_SPEED_SUPER: - /* It's limitation that driver assumes in driver. */ - mult = 0; - max_packet_size = 1024; - if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) { - maxburst = priv_dev->ep_iso_burst - 1; - buffering = (mult + 1) * - (maxburst + 1); - - if (priv_ep->interval > 1) - buffering++; - } else { + if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) { + max_packet_size = 1024; maxburst = priv_dev->ep_buf_size - 1; } break; @@ -2139,7 +2128,6 @@ int cdns3_ep_config(struct cdns3_endpoin if (priv_dev->dev_ver < DEV_VER_V2) priv_ep->trb_burst_size = 16;
- mult = min_t(u8, mult, EP_CFG_MULT_MAX); buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX); maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
@@ -2173,7 +2161,7 @@ int cdns3_ep_config(struct cdns3_endpoin }
ep_cfg |= EP_CFG_MAXPKTSIZE(max_packet_size) | - EP_CFG_MULT(mult) | + EP_CFG_MULT(priv_ep->mult) | /* must match EP setting */ EP_CFG_BUFFERING(buffering) | EP_CFG_MAXBURST(maxburst);
@@ -2263,6 +2251,13 @@ usb_ep *cdns3_gadget_match_ep(struct usb priv_ep->type = usb_endpoint_type(desc); priv_ep->flags |= EP_CLAIMED; priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0; + priv_ep->wMaxPacketSize = usb_endpoint_maxp(desc); + priv_ep->mult = USB_EP_MAXP_MULT(priv_ep->wMaxPacketSize); + priv_ep->wMaxPacketSize &= USB_ENDPOINT_MAXP_MASK; + if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && comp_desc) { + priv_ep->mult = USB_SS_MULT(comp_desc->bmAttributes) - 1; + priv_ep->bMaxBurst = comp_desc->bMaxBurst; + }
spin_unlock_irqrestore(&priv_dev->lock, flags); return &priv_ep->endpoint; @@ -3044,22 +3039,40 @@ static int cdns3_gadget_check_config(str struct cdns3_endpoint *priv_ep; struct usb_ep *ep; int n_in = 0; + int iso = 0; + int out = 1; int total; + int n;
list_for_each_entry(ep, &gadget->ep_list, ep_list) { priv_ep = ep_to_cdns3_ep(ep); - if ((priv_ep->flags & EP_CLAIMED) && (ep->address & USB_DIR_IN)) - n_in++; + if (!(priv_ep->flags & EP_CLAIMED)) + continue; + + n = (priv_ep->mult + 1) * (priv_ep->bMaxBurst + 1); + if (ep->address & USB_DIR_IN) { + /* + * ISO transfer: DMA start move data when get ISO, only transfer + * data as min(TD size, iso). No benefit for allocate bigger + * internal memory than 'iso'. + */ + if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) + iso += n; + else + n_in++; + } else { + if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) + out = max_t(int, out, n); + } }
/* 2KB are reserved for EP0, 1KB for out*/ - total = 2 + n_in + 1; + total = 2 + n_in + out + iso;
if (total > priv_dev->onchip_buffers) return -ENOMEM;
- priv_dev->ep_buf_size = priv_dev->ep_iso_burst = - (priv_dev->onchip_buffers - 2) / (n_in + 1); + priv_dev->ep_buf_size = (priv_dev->onchip_buffers - 2 - iso) / (n_in + out);
return 0; } --- a/drivers/usb/cdns3/cdns3-gadget.h +++ b/drivers/usb/cdns3/cdns3-gadget.h @@ -1168,6 +1168,9 @@ struct cdns3_endpoint { u8 dir; u8 num; u8 type; + u8 mult; + u8 bMaxBurst; + u16 wMaxPacketSize; int interval;
int free_trbs;